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gr007_multigraph.C File Reference

Detailed Description

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TMultiGraph is used to combine multiple graphs into one plot.

Allowing to overlay different graphs can be useful for comparing different datasets or for plotting multiple related graphs on the same canvas.

auto c1 = new TCanvas("c1","multigraph",700,500);
c1->SetGrid();
//Initialize a TMultiGraph to hold multiple graphs
//This ensures the entire dataset from all added graphs is visible without manual range adjustments.
auto mg = new TMultiGraph();
//Create first graph
const Int_t n1 = 10;
Double_t px1[] = {-0.1, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Double_t py1[] = {-1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Double_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Double_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
auto gr1 = new TGraphErrors(n1,px1,py1,ex1,ey1);
gr1->SetMarkerColor(kBlue);
gr1->SetMarkerStyle(21);
gr1->Fit("gaus","q");
auto func1 = (TF1 *) gr1->GetListOfFunctions()->FindObject("gaus");
func1->SetLineColor(kBlue);
//Add the first graph to the multigraph
mg->Add(gr1);
//Create second graph
const Int_t n2 = 10;
Float_t x2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01};
Float_t y2[] = {2.1,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
Float_t ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04};
Float_t ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7};
auto gr2 = new TGraphErrors(n2,x2,y2,ex2,ey2);
gr2->SetMarkerColor(kRed);
gr2->SetMarkerStyle(20);
gr2->Fit("pol5","q");
auto func2 = (TF1 *) gr2->GetListOfFunctions()->FindObject("pol5");
func2->SetLineColor(kRed);
func2->SetLineStyle(2);
//Add the second graph to the multigraph
mg->Add(gr2);
mg->Draw("ap");
//Force drawing of canvas to generate the fit TPaveStats
c1->Update();
auto stats1 = (TPaveStats*) gr1->GetListOfFunctions()->FindObject("stats");
auto stats2 = (TPaveStats*) gr2->GetListOfFunctions()->FindObject("stats");
if (stats1 && stats2) {
stats1->SetTextColor(kBlue);
stats2->SetTextColor(kRed);
stats1->SetX1NDC(0.12); stats1->SetX2NDC(0.32); stats1->SetY1NDC(0.82);
stats2->SetX1NDC(0.72); stats2->SetX2NDC(0.92); stats2->SetY1NDC(0.75);
c1->Modified();
}
}
int Int_t
Definition RtypesCore.h:45
float Float_t
Definition RtypesCore.h:57
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kBlue
Definition Rtypes.h:66
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Option_t Option_t TPoint TPoint const char x2
Option_t Option_t TPoint TPoint const char y2
R__EXTERN TStyle * gStyle
Definition TStyle.h:442
The Canvas class.
Definition TCanvas.h:23
1-Dim function class
Definition TF1.h:233
A TGraphErrors is a TGraph with error bars.
A TMultiGraph is a collection of TGraph (or derived) objects.
Definition TMultiGraph.h:34
The histogram statistics painter class.
Definition TPaveStats.h:18
void SetOptFit(Int_t fit=1)
The type of information about fit parameters printed in the histogram statistics box can be selected ...
Definition TStyle.cxx:1595
return c1
Definition legend1.C:41
Author
Rene Brun

Definition in file gr007_multigraph.C.